Quick breakdown:
-Half the price of similar adapters
-Solid, nearly all metal, no plastic to be seen
-Tightening knob a little loose, works totally fine
-Bubble level is not great, use your head's bubble
-Comes with 3/8 adapter
-Has 3 screws for locking to your head.
-Don't turn the knob all the way to loose, and it'll loosen up better.